HPCC-9360 Add subgraph with properties grid to graph page

Added subgraph index as it will typically have more items than the timings list.

fixes HPCC-9360

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4395 from GordonSmith/HPCC-9360

HPCC-9360 Add subgraph with properties grid to graph page

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>